Koch will be joined by Brooklyn Councilman Dominic Recchia and former congressman Michael McMahon, who held the seat until 2010, when he was beaten by Republican Michael Grimm.

Grimm has been besieged by bad press for most of the year, covering everything from his past business dealings to his fund-raising for the 2010 race, but still maintains a 10-point lead in the latest public polls.

Grimm has also proven an adept fund-raiser, having raised $1.6 million through the end of June, with $1.2 million of that still on hand at the time.